Control information transmission method and apparatus

Abstract

This application provides a control information transmission method, including: A terminal device receives a first control message on a first resource, where the first control message carries a transmission bandwidth indication field, the transmission bandwidth indication field is a first value, and the first value indicates that a current transmission bandwidth indication is an invalid indication. The terminal device receives a second control message on a second resource, where the second control message carries the transmission bandwidth indication field, the transmission bandwidth indication field is a second value, and the second value indicates an actual transmission bandwidth. The first resource and the second resource are in a same channel occupancy time COT. The terminal device transmits data on the actual transmission bandwidth.

What is claimed is: 
     
         1 . A control information transmission method, comprising:
 receiving, by a terminal device, a first control message on a first resource, wherein the first control message carries a transmission bandwidth indication field, the transmission bandwidth indication field is a first value, and the first value indicates that a current transmission bandwidth indication is an invalid indication;   receiving, by the terminal device, a second control message on a second resource, wherein the second control message carries the transmission bandwidth indication field, the transmission bandwidth indication field is a second value, and the second value indicates an actual transmission bandwidth, wherein   the first resource and the second resource are in a same channel occupancy time (COT); and   transmitting, by the terminal device, data on the actual transmission bandwidth.   
     
     
         2 . The method according to  claim 1 , wherein
 the first control message and the second control message are group common-physical downlink control channels GC-PDCCHs.   
     
     
         3 . The method according to  claim 1 , wherein the method further comprises:
 after receiving the first control message, increasing, by the terminal device, a periodicity for detecting downlink control information.   
     
     
         4 . The method according to  claim 1 , wherein the method further comprises:
 after receiving the second control message, adjusting, by the terminal device, a quantity of sub-bands on which the downlink control information is detected.   
     
     
         5 . The method according to  claim 1 , wherein the method further comprises:
 receiving, by the terminal device, data on a third resource, wherein an interval between the third resource and the second resource is at least one time unit.   
     
     
         6 . The method according to  claim 1 , wherein
 the first control message carries information about the second resource.   
     
     
         7 . The method according to  claim 1 , wherein the method further comprises:
 receiving, by the terminal device, a third control message, wherein the third control message carries an available bandwidth indication field, the available bandwidth indication field is a first value, and the first value indicates that a current available bandwidth indication is an invalid indication, wherein   the third control message indicates channel occupancy time COT duration, and a fourth resource is located in the COT duration, wherein a defaulted or indicated channel access manner corresponding to the fourth resource is a first channel access manner; and   obtaining, by the terminal device, the fourth resource in a second channel access manner.   
     
     
         8 . The method according to  claim 7 , wherein
 the first channel access manner comprises a Type 1 channel access procedure or CAT 4 LBT, and/or   the second channel access manner comprises a Type 2 channel access procedure or CAT 2 LBT.   
     
     
         9 . A control information transmission method, comprising:
 sending, by a network device, a first control message to a terminal device on a first resource, wherein the first control message carries a transmission bandwidth indication field, the transmission bandwidth indication field is a first value, and the first value indicates that a current transmission bandwidth indication is an invalid indication;   sending, by the network device, a second control message to the terminal device on a second resource, wherein the second control message carries the transmission bandwidth indication field, the transmission bandwidth indication field is a second value, and the second value indicates an actual transmission bandwidth, wherein   the first resource and the second resource are in a same channel occupancy time COT; and   transmitting, by the network device, data with the terminal device on the actual transmission bandwidth.   
     
     
         10 . The method according to  claim 9 , wherein
 the first control message and the second control message are group common-physical downlink control channels GC-PDCCHs.   
     
     
         11 . The method according to  claim 9 , wherein
 the first control message carries information about the second resource.   
     
     
         12 . The method according to  claim 9 , wherein the method further comprises:
 sending, by the network device, data to the terminal device on a third resource, wherein an interval between the third resource and the second resource is at least one time unit.   
     
     
         13 . The method according to  claim 9 , wherein the method further comprises:
 sending, by the network device, a third control message, wherein the third control message carries an available bandwidth indication field, the available bandwidth indication field is a first value, and the first value indicates that a current available bandwidth indication is an invalid indication, wherein   the third control message indicates channel occupancy time COT duration, and a fourth resource is located in the COT duration, wherein a defaulted or indicated channel access manner corresponding to the fourth resource is a first channel access manner; and   obtaining, by the terminal device, the fourth resource in a second channel access manner.   
     
     
         14 . A communications apparatus, comprising:
 a processor and a memory, wherein the processor is configured to execute a software program stored in the memory to:   receive a first control message on a first resource, wherein the first control message carries a transmission bandwidth indication field, the transmission bandwidth indication field is a first value, and the first value indicates that a current transmission bandwidth indication is an invalid indication;   receive a second control message on a second resource, wherein the second control message carries the transmission bandwidth indication field, the transmission bandwidth indication field is a second value, and the second value indicates an actual transmission bandwidth, wherein   the first resource and the second resource are in a same channel occupancy time (COT); and   transmit data on the actual transmission bandwidth.   
     
     
         15 . The apparatus according to  claim 14 , wherein
 the first control message and the second control message are group common-physical downlink control channels GC-PDCCHs.   
     
     
         16 . The apparatus according to  claim 14 , wherein the processor is further configured to execute the software program to:
 increase, after receiving the first control message, a periodicity for detecting downlink control information.   
     
     
         17 . The apparatus according to  claim 14 , wherein the processor is further configured to execute the software program to:
 adjust, after receiving the second control message, a quantity of sub-bands on which the downlink control information is detected.   
     
     
         18 . The apparatus according to  claim 14 , wherein the processor is further configured to execute the software program to:
 receive data on a third resource, wherein an interval between the third resource and the second resource is at least one time unit.   
     
     
         19 . The apparatus according to  claim 14 , wherein
 the first control message carries information about the second resource.   
     
     
         20 . The apparatus according to  claim 14 , wherein the processor is further configured to execute the software program to:
 receive, a third control message, wherein the third control message carries an available bandwidth indication field, the available bandwidth indication field is a first value, and the first value indicates that a current available bandwidth indication is an invalid indication, wherein   the third control message indicates channel occupancy time COT duration, and a fourth resource is located in the COT duration, wherein a defaulted or indicated channel access manner corresponding to the fourth resource is a first channel access manner; and   obtain, the fourth resource in a second channel access manner.